Answer:
rift vallys but im not for sure
Explanation:
The answer is a. lack of income.
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Impede means "stop." Not being rich does not stop the spread of culture. And by physical features, that means thing like "mountains" and "rivers", which can stop people from spreading out.
Hope this helps with the answer to your question
A 2014 Reuters analysis found that, before 1971, water reached flood levels no more than five days every year (on average) in several U.S. east coast cities. Since 2001, however, that number has risen to 20 days or more (on average).
